The northern Inner Mongolia autonomous region had proven coal reserves of 741.4 billion mt, the largest nationwide, at the end of last year. It surpassed neighboring Shanxi province to become the largest coal producing region last year with an annual output of 782 million mt. Shanxi’s coal output reached 790 million mt in the January-November period, an annual increase of 18.6%, according to the provincial statistics bureau. The November output rose 15.3% to hit a monthly record of 80.8 million mt due to a spike in the demand for the fossil fuel to power generators and provide heating in winter.